Shell mount for rock drills



March 18,1930. BAYLIFF ET AL 1,751,302

SHELL MOUNT FOR ROCK DRILLS Filed Dec. 24. 1927 INVENTORS Frank 5a //'ff Gavan/e /Ve// 1924 K3 2% ATTORNEY.

Patented Mar. 18, 1930 UNITED STATES Parent. erases FRANK BAYLIFF, OF BUTTE, MONTANA, AND GUSTAVE IVL NELL, OF DETROIT, MICHI- GAN, ASSIGNORS TO CHICAGO PNEUMATIC TOOL COMPANY, OF NEW YORK, N. Y.,

A CORPORATION OF NEW JERSEY SHELL MOUNT FOR BOOK DRILLS Application filed December 2 1, 1927.

This invention relates to supporting means for drilling machines of the percussive type. It particularly concerns supports utilizing feeding means for advancing the machine to the work, such as the so-called shell mounts for drills used in drifting operations and provided with a manually actuated feed screw.

One, object of the invention is to eliminate or to reduce breakage of the supporting means. Another object is to relieve such means of at least a portion of the shocks and vibration incident to the operation of a percussive machine mounted thereon. Another object is to improve generally the construction of shell mounts in order to lengthen the life of the same and to secure better results from the use thereof. Other objects will be apparent from the detailed description which follows.

In order to illustrate the invention concrete embodiments thereof are shown in the accompanying drawings, in which:

Fig. l is a top plan viewof a shell mount;

Fig. 2 is a side elevational View of the mount shown in Fig. 1 with a rock drill supported thereon;

Fig. 3 is a plan view similar to Fig. 1 showing a modification;

Fig. 4L is a top plan'view of still another form of shell mount with a rock drill supported thereon; and

Fig. 5 is a top plan View of still another form of the invention.

The invention 1s disclosed 1n connection with shell mounts of the conventional type comprising a channel-shaped casting or forging (1 having under-cut or longitudlnally grooved sides 1) providing slide ways for the projecting flanges or wing portions 02 of a rock drill 3 (Fig. 2). The feed screw 0 is Serial No. 242,383.

relation with shell a by suitable means interposed between it and shell a. In the form of the invention shown in F igs. 1 and 2 such means comprise spacing sleeves h and resilient means 6. The resilient means preferably take the form of coil springs encircling the shell rods gand interposed between spacers h and the shell 64. With this construction feed screw 0 is held rigidly against movement to the right or rearwardly of the drill but is permitted a limited range of yielding movement by springs 6 in the opposite axial direction. but support 6 is rigid. Feed screw 0 is arranged to move with support 0! and has an elongate reduced portion at its op osite end for sliding engagement with the earing in support 6.

The form of the invention shown inFig.

3 is in all respects similar to that shown in Figs. 1 and 2 with the exception that the resilient means, such as springs 7, are disposed at the forward or left-hand ends of shell rods 9 with the result that support (Z is now yielding movement of feed screw crelative to shell a is provided for in both axial directions. The" springs 8 permitting the support to move to the left while springs 9 permit its movement 7 to the right. Feed screw 0 moves with support cl and is arranged for sliding movement in the bearing in support 6. v

In the form of the invention shown in Fig. 5, support 6 directly engages the shell casting or forging a as in Figs. 1-3 inclusive.

Support d can yield in one direction tion of breakage of parts.

a In the form shown of the drill is reduced.

is at least partly relieved of the shocks and Support (Z, on the contrary, is yieldingly movable in both directions by reason of coil springs 10 on shell rod 9 between support (Z and the ends of the rods and by similar coil springs 11 on the rods between support (Z and shell a. With this construction springs 10 and 11 form both the spacing and the resilient means. Feed screw 0, as in the previous arrangements, moves with support cl and has sliding contact with the bearing in support 0. If desired, one of the springs on each of theshell rods 9, such as 10, may be arranged to lock the rod against turning movement under the vibration of the drill. spring lOis provided with projections 10 at either end which lit in complementa-l recesses in theheadsof bolts-g and in support (Z- respectively.

From the above it will be apparentthat the resent invention provides for limited yielding movement'of the feed screw of a shell mounting in one or both axial directions.

By this arrangement the wear upon the feed screw of the mounting and upon the feed nut The shell mounting vibration incident to the operation of the drill with a consequent elimination or reduc- Such constructions also tend to increase the drilling speed inasmuch as the operator can tell by compression of certain of the springs that the steel is against the work.

silient means tend to keep the parts of the drilling machine and of the shell mounting from loosening up.

"l/Vhile preferred forms of the invention limited to the specific details thereof, but covers all changes, modifications, and adaptations within the scope of the appended claims.

WVe claim as our invention:

1.'The combination with a percussive machine of-a support providing for axial movement of said machine thereon, manually actuated means for moving'said machine on saidsupport, and resilient means for absorbing shocksand vibration of said machine in both directions.

2. The combination with a percussive drill of a shell mounting therefor, means for moving said drill upon said mounting and means providing for cushioned movement of said first-named means in one direction.

3. The combination with a percussive drill of a shell mounting therefor providing slide yielding movement in one direction on's'aid' mounting for supporting said feed screw.

4. The combination with a percussive drill Further, the absorption of vibration and shocks by "the re- -1nounting, and supports adjacent opposite ends of said mounting, one of said supports providing a loosebearing for the adjacent end of said feed screw, the other support being mounted forlimited yielding movement relative to said mounting but forminga fixed bearing for said shaft. 7

6. A shell mounting for rock drills coma support providing a bearing for said screw disposed in spaced relation'to said member, and means permitting limited yielding movement of said support relative to said member.

A. shell mounting for rock drills 'com prislng a member having guide ways to receive wing projections on the drill, a feed screw for moving the drill upon said member,

- a support providing a bearing for said screw,

means securing said support to said member but in spaced relation to'the latter, and resillent means permitting limited movement of said support on said-first-named means.

'A shell -mounting for rock drills compr s ng a member having guide ways to rece1ve-w1ng projections on the drill, a feed screw formoving the drill upon said member, bolts extending from said member, a support carried by said bolts and providing a bearing for said screw, and spacing and resilient means lnterposed between said support and sa1d member.

Q A shell mounting'for rock drills comprising a member having guide'ways to receive wing projections on the drill, a feed screw for moving the drill upon said member, bolts extending from said member,'a support carried by said bolts and providing abearing for said screw, and coil springs on'said bolts between said support and saidmember. 1

TO. A shell mounting for rock drills comprisinga member having'guide ways torecelve wlng projections on the drill, a'feed screw for moving the'drill upon said member, bolts extending from said member, a support carried by said bolts and providing a bearing for said screw, and resilient means on said bolts on oppositesides of said support.

11. A shell mounting for ro'ckdrills comprising a member having guide ways to re ceive wing projections on the drill, a feed screw for movlng the drill upon said member, bolts extending from said member, a support carried by said bolts and providing a bearing for said screw, and coil springs on said bolts on opposite sides of said support.

12. A shell mounting for rock drills comprising a member having guide ways to reoeive wing projections on the drill, a feed screw for moving the drill upon said member, bolts extending from said member, a support carried by said bolts and providing a bearing for said screw, resilient means on said bolts on opposite sides of said support, and means utilizing certain of said resilient means for locking said bolts against turning.

13. A shell mounting for rock drills comprising a member having guide ways to receive wing projections on the drill, a feed screw for moving the drill upon said member, bolts extending from said member, a support carried by said bolts on opposite sides of said support, and means utilizing certain of said springs for locking said bolts against turning. 1

Signed by me at Butte, Montana, this 5th day of December, 1927.

FRANK BAYLIFF. Signed by me at Detroit, Michigan, this 15th day of December, 1927.

GUSTAVE M. NELL. 

